I didn't have time today, but try to tomorrow, to post what Struthers & Dun
says. I have a book here they wrote on relay engineering which discuss this. I
promised the original poster I'd do it, but will be tomorrow before I can look
it all up. About the best thing is experiment starting about 10 Vdc and working
up until it closes at the proper speed and stays in without overheating. Put a
diode across the coil to kill off the spike from the L of the coil as it can
help on coil life, and also the transceivers circuit keying it.
Best,
Will
*********** REPLY SEPARATOR ***********
On 1/30/06 at 8:06 PM Barrie Smith wrote:
>>
>> At 10:24 AM 1/30/2006, David C. Hallam wrote:
>>
>>>Bill states that an AC relay will
>>>operate without damage at a DC voltage of about 70% of its rated AC.
>
>> I'd be careful of generic statements like that. You're likely to come
>> across a relay where that is not true. Use it as a starting point and
>> test it carefully.
>>
>> 73, Bill W6WRT
>
>All (quite a number, actually) of the 120 volt AC relays I've tried and
>tested have not closed at 12 volts DC, not even with help. Many will
>close
>at about 18 to 20 volts, some needing a nudge. All will close at what
>appears to be proper speed at 26 volts DC.
>
>None exhibited over-heating.
>
>73, Barrie, W7ALW
>
>
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